"Overboost" is a very inaccurate term for what you fellas are describing. In fact, not applicable to jet engines. You can "exceed the trust limit" or "overthrust". Too much air is exiting the engine.
Overboost is applicable to a turbocharger or compressor, i.e. too high pressure air is being forced into the engine.
The vast difference is that exceeding a thrust limit will likely not cause any damage to the engine, as long as it is done within safe parameters for the engine (like N1, N2 and EGT). Rather is has to do with the airframe, certified limits for engine mounts etc.
Overboosting a turbo/supercharged piston engine, will however, most like cause the engine to fail.
Hence, the need to differentiate, as most people connote "overboosting" as a dangerous condition for a jet engine, based on their knowledge of the expression in piston engine circumstances.
Last edited by cosmo kramer; 5th Nov 2014 at 21:17.